20.500.12556/RUL-170930 Is an exact backside irradiance modelling essential for bifacial PV systems? Backside irradiance modelling for photovoltaic (PV) modules is not simple and straightforward as it highly depends on the situation of an actual system. In addition, the irradiance conditions can change from one side of a PV system to the other due to the reflections from the ground or surroundings. Currently, all available models are based on analytical methods. Here, we present a new empirical model for backside irradiance for fixed PV systems modelled by a Gaussian function on the backside irradiance share and compare the results with an analytical model. Furthermore, we have applied different backside irradiance calculations to a PV performance rating model and compared the results. Our calculations, verified with the data from three different locations in Europe, have shown that for common PV systems, where the backside irradiance share is relatively low, annual PV performance calculations can be performed with a fixed backside irradiance share value. PV systems backside irradiance modelling energy yield PV sistemi sevanje na zadnji strani modeliranje energijski donos true false true Angleški jezik Slovenski jezik Članek v reviji 2025-07-21 15:30:19 2025-07-21 15:30:23 2026-07-03 13:52:32 0000-00-00 00:00:00 2026 0 0 11 str. pt. A, art. 123942 Vol. 256 Jan. 2026 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 0000-00-00 621.383 1879-0682 10.1016/j.renene.2025.123942 243091203 1-s2.0-S0960148125016064-main.pdf 1-s2.0-S0960148125016064-main.pdf 1 3BFD963C13811A1FE1B7850EEC197490 3e1fe6b5858959c9d04728f0043541b93360bff1e55b362feb5c0f36333f283e 0ec21cb3-4d31-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=233674 https://www.sciencedirect.com/science/article/pii/S0960148125016064 0 c0b2a5ff-6637-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=213216 Fakulteta za elektrotehniko 0 0 0